Blog
Adding a blog to an existing website is a great way to extend the features on your website, particularly if you are running a business.
It gives you an excellent opportunity to interact with your clients, potential clients and industry peers, not too mention that blogs are great for SEO (search engine optimization) due to the dynamic nature of blogs, and the ability to keep updated content flowing on your site.
Having a blog also allows your business to provide a built-in RSS feed so your clients, readers and peers can keep up-to-date about your company news through your RSS feed.